The Shuttle is currently docked to the International Space Station, so that may very well be what you saw.

This site http://heavens-above.com/ lets you track sattelites, the ISS, and other celestial bodies based on your earthbound location.

This is another site that lets you do the same thing with only the ISS and the shuttle.

http://spaceflight.nasa.gov/realdata/sightings/cities/skywatch.cgi?country=United+States